BATTERY VOLTAGE(V) LTC1732-8.4 Lithium-Ion Linear Battery Charger Controller FEATURES DESCRIPTIO n Complete Linear Charger Controller for 2-Cell The LTC 1732-8.4 is a complete constant-current/con- Lithium-Ion Batteries stant-voltage linear charge controller for lithium-ion n Preset Charge Voltage with 1% Accuracy (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal- n Programmable Charge Current hydride (NiMH) batteries can also be charged with con- n C/10 Charge Current Detection Output stant current using external termination. Charge current n Programmable Charge Termination Timer can be programmed with 7% accuracy using external n Small, Thin 10-Pin MSOP Package sense and program resistors. An internal resistor divider n Input Supply (Wall Adapter) Detection Output and precision reference set the final float voltage with 1% n 8.8V to 12V Input Voltage Range accuracy. n Automatic Sleep Mode When Input Supply When the input supply is removed, the LTC1732-8.4 Is Removed (Only 10m A Battery Drain) automatically enters a low current sleep mode, dropping n Automatic Trickle Charging of Low Voltage Cells the battery drain current to 10m A. An internal comparator n Programmable for Constant-Current-Only Mode detects the end-of-charge (C/10) condition while a pro- n Battery Insertion Detect and Automatic Charging grammable timer, using an external capacitor, sets the of Low-Battery total charge time. Fully discharged cells are automatically n Automatic Battery Recharge trickle charged at 10% of the programmed current until battery voltage exceeds 4.9V. U APPLICATIO S The LTC1732-8.4 begins a new charge cycle when a discharged battery is connected to the charger or when the n Cellular Phones input power is applied. In additon, if the battery remains n Handheld Computers connected to the charger and the cell voltage drops below n Charging Docks and Cradles 8.05V, a new charge cycle will begin. n Digital Cameras and Camcorders , LTC and LT are registered trademarks of Linear Technology Corporation. The LTC1732-8.4 is available in the 10-pin MSOP package. TYPICAL APPLICATIO 400mA 2-Cell 8.4V Li-Ion Battery Charger Typical Li-Ion Charge Cycle V = 10V IN 9 CONSTANT CONSTANT MBRM120T3 CURRENT VOLTAGE 2 8 BATTERY VOLTAGE R1 R2 R SENSE 1k 1k SEL V 1F CC 0.25 400 8 9 400mA HR BATTERY SENSE 3 7 Q1 CHRG DRV 300 Si9430DY CHARGE CURRENT LTC1732-8.4 I = 400mA BAT 10 1 200 7 ACPR BAT CHRG 4 6 LED OFF TIMER PROG TIMER 100 STOPS C + TIMER 8.4V GND R * PROG 10F 0.1F Li-Ion 5 19.6k BATTERY 0 6 0 0.5 1.0 1.5 2.0 2.5 3.0 TIME (HOURS) *SHUTDOWN INVOKED BY FLOATING THE PROG PIN 1732-8.4 TA01 1732-8.4 TA01b 17328f 1 CHARGE CURRENT (mA) U ULTC1732-8.4 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Input Supply Voltage (V ) ................................... 13.2V CC ORDER PART SENSE, DRV, BAT, SEL, NUMBER TOP VIEW TIMER, PROG, CHRG, ACPR ................. 0.3V to 13.2V BAT 1 10 ACPR LTC1732EMS-8.4 SEL 2 9 SENSE Operating Temperature Range (Note 2) .... 40 to 85 C CHRG 3 8 V CC TIMER 4 7 DRV Storage Temperature Range ................. 65 C to 150 C GND 5 6 PROG Lead Temperature (Soldering, 10 sec).................. 300 C MS10 PART MARKING MS10 PACKAGE 10-LEAD PLASTIC MSOP T = 140 C, q = 180 C/W JMAX JA LTWW Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 9V unless otherwise noted. A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Supply Voltage l 8.8 12 V CC I Input Supply Current Charger On, Current Mode l 13 mA CC Shutdown Mode l 13 mA Sleep Mode (Battery Drain Current) 10 30 m A V Regulated Output Float Voltage 9V V 12V, V = V l 8.316 8.4 8.484 V BAT CC SEL CC I Current Mode Charge Current R = 19.6k, R = 0.2W 465 500 535 mA BAT PROG SENSE R = 19.6k, R = 0.2W l 415 585 mA PROG SENSE R = 97.6k, R = 0.2W 60 100 140 mA PROG SENSE I Trickle Charge Current V = 4V, R = 19.6k, I = (V V )/0.2W l 30 50 125 mA TRIKL BAT PROG TRIKL CC SENSE V Trickle Charge Threshold Voltage From Low to High l 4.7 4.9 5.1 V TRIKL V V Undervoltage Lockout Voltage From Low to High l 8.2 8.7 V UV CC D V V Undervoltage Lockout Hysteresis 400 mV UV CC V Manual Shutdown Threshold Voltage PROG Pin Low to High 2.457 V MSD PROG Pin High to Low 2.446 V V Automatic Shutdown Threshold Voltage (V V ) High to Low 30 54 90 mV ASD CC BAT (V V ) Low to High 40 69 100 mV CC BAT V Voltage Mode Disable Threshold Voltage V = V V 0.4 V DIS DIS CC TIMER I PROG Pin Current Internal Pull-Up Current, No R 2.5 m A PROG PROG PROG Pin Source Current, D V 5mV l 300 m A PROG V PROG Pin Voltage R =19.6k 2.457 V PROG PROG V ACPR Pin Output Low Voltage I = 5mA 0.6 1.2 V ACPR ACPR I CHRG Pin Weak Pull-Down Current V = 1V 15 35 55 m A CHRG CHRG V CHRG Pin Output Low Voltage I = 5mA 0.6 1.2 V CHRG CHRG I Drive Pin Current V = V 2V 26 m A DRV DRV CC 17328f 2 U W U U WWW